Hanxin Xiao, Shunwen Wei
Carbonaceous gold ores are difficult to process due to the preg-robbing effect of carbonaceous matter and the encapsulation of gold within gangue minerals. In this study, fluidized bed oxidation roasting in a controlled O2/CO2 atmosphere (O2:CO2 ratio of 1:4 and a total flow rate of 2 L/min) was proposed as a pretreatment to enhance gold leaching from a refractory carbonaceous gold ore. The effects of roasting temperature on phase transformation, carbon removal, sulfur fixation, microstructure, porosity, gold dissociation, and leaching efficiency were systematically investigated through XRD, SEM, BET, and chemical phase analysis. The results demonstrated that roasting at 650◦C achieved efficient carbon removal (94.04%) and sulfur fixation (73.60% as anhydrite), while simultaneously inducing the thermal decomposition of carbonates and silicates, which generated a highly porous structure with an enlarged average pore diameter of 27.1 nm. These synergistic transformations liberated gold from its encapsulating matrix, increasing the proportion of exposed gold from 28.85% to 84.10% and yielding a maximum gold leaching efficiency of 80.26%. However, excessive temperature (700 ◦C) led to sintering and pore collapse, reducing the leaching efficiency to 73.87%. This study demonstrates that fluidized bed roasting in a controlled O2/CO2 atmosphere is a promising pretreatment strategy for refractory carbonaceous gold ores, though further optimization of roasting parameters is needed to improve gold recovery.
@article{632d7397-320e-4dac-8476-d4e86940bcf1,
title={2026 Xiao Fluidized roasting and gold leaching of carbonaceous ore},
author={Hanxin Xiao and Shunwen Wei},
year={2026},
language={en}
}TY - JOUR TI - 2026 Xiao Fluidized roasting and gold leaching of carbonaceous ore AU - Hanxin Xiao AU - Shunwen Wei PY - 2026 LA - en ER -
FATHI HABASHI
In the past few years, extractive metallurgy has been advancing gradually, despite the absence of remarkable new ideas. This paper aims to summarize t
This paper addresses the challenge of assessing the feasibility of wind power plant projects at sites with insufficient or no local historic wind data
Important advances in electrochemical engineering technology over the last three decades have fostered the development of a lternative methods to alle